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54 lines
1.5 KiB
Python
54 lines
1.5 KiB
Python
from PIL import Image
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def change_brightness(img: Image.Image, level: float) -> Image.Image:
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"""
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Change the brightness of a PIL Image to a given level.
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Args:
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img: PIL Image to adjust
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level: Brightness level adjustment (-255.0 to 255.0)
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Negative values darken, positive values brighten
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Returns:
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New PIL Image with adjusted brightness
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Raises:
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ValueError: If level is not in range [-255.0, 255.0]
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>>> from PIL import Image
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>>> import numpy as np
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>>> img = Image.new('RGB', (2, 2), color=(100, 100, 100))
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>>> bright = change_brightness(img, 50)
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>>> px = bright.load()
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>>> px[0, 0]
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(150, 150, 150)
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>>> dark = change_brightness(img, -50)
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>>> px_dark = dark.load()
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>>> px_dark[0, 0]
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(50, 50, 50)
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>>> change_brightness(img, 300)
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Traceback (most recent call last):
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...
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ValueError: level must be between -255.0 (black) and 255.0 (white)
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"""
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def brightness(c: int) -> float:
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"""
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Fundamental Transformation/Operation that'll be performed on
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every bit.
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"""
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return 128 + level + (c - 128)
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if not -255.0 <= level <= 255.0:
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raise ValueError("level must be between -255.0 (black) and 255.0 (white)")
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return img.point(brightness)
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if __name__ == "__main__":
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# Load image
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with Image.open("image_data/lena.jpg") as img:
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# Change brightness to 100
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brigt_img = change_brightness(img, 100)
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brigt_img.save("image_data/lena_brightness.png", format="png")
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